Method of forming bearings.



N. L. OBREGHT. METHOD 0F PORMING BEARINGS.

APPLIogTloN FILED AUG. so, 1913.

Patented Feb. 23, 1915.

N. L. OBRECHT. METHOD OF FORMING BEARINGS.

APPLICATION FILED AUG. ao, 1913.

LMQAW. y PatentedFeb.23,1915.

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NOnnEnT r.. onnECnT, or DETROIT, MICHIGAN, nss'IeNon, BY DIRECT AND MEsNE ASSIGNMENTS, To mann s. BEARING COMPANY, OE DETROIT, MICHIGAN,- a TART- NEB'SHIP COOSED OF SXILLM.

fpecicationef Letters Patent.

i' "I HOD 0F FORMING BEARINGS.

Application led'ug'ust 30, 1913i. Serial No. 787,499.

To all who-m it may concern:

Be it known that l, NORBERT L. UnnEoHT,

a citizen of the United States of America, 'residing at Detroit, in the county of Wayne and State of Michigan, have lnvented certain new and useful lmprovementsin Methods of Forming Bearings, of which the following is a specification, reference being had therein, to the accompanying drawin s.

My invention relates to a method o forming bearings and resides in the novel steps in the making of the bearing, as will more f strip of lubricating fabric from which the bushing is made; Figs. 5, 6 and? illustrate certain steps in the formation of the bearing; Fig. 8- is a perspectiveview of one of the bearing parts.

mixture being maintainedat a .temperature The bearing formed-A by mv improved method comprises two sections B and C positioned one within the other Vfor relative movement` and a lubricating bushing D ofcompressible material arranged intermediate the sections and compressed therebetween. -ln forming the bearing the bushing is arranged upon one'of thesections and the inner section C thenv positioned within the outer, the bushingl) .being compressed during the forming of the'bearing, so that when the parts are assembled inoperative relation, the bushing is compressedl intermediate the relatively movable sections.

Preferably the bushing is made from a strip -Erof asbestos havinginterwoven thereina sudicient' quantity of fine wire to better maintain the shape of, the fabric, the asbesf' tos being impregnated with asolid lubricant. The asbestos is preferably impreg- -nated by placing the same in a. mixture of th having about the'proportions of oil, tallowA and nely powdered graphite two of graphite, one of oil and one of tallow, the

ends ofthe fabric. 4

.of Vabout 300 degrees F. so as to increase the liquidity of the oil and tallow, to permit the same to carry the graphite thoroughly between the fibers of the asbestos. The length of time which the asbestos remains in the mixture depends of course, upon the thickness of the fibrous 'substance employed. After the asbestos strip has been properly treated it is'cut into lengths equal to the circumference of the inner member. One end of the strip as F is preferably tapered and the other end provided with a coperatf ing recess G, as shown in Fig. 4, so -as to provide a better joint between the meeting lin .one manner of formingthe bearing the strip 1s wrapped around' the inner member "2. SKILIILliIAN, NORBERT L. GERECHT, AND NEWTON A ratenteanenaaraia.

and sucientlycompressed thereabout so that it will remain in engagementwith the inner member during the telescoping of the sections. After the parts are so assembled they are placed in a suitable machine and the outer member contracted or the inner ter operation the fibrous material is compressed so that it is exceedingly hard. .ln Figs. 1 to 3 inclusive and 4 to 8 inclusive of expanded by suitable dies. During the latthe Vdrawing the inner member vis illustrated f as formed of a sleeve. and in Fig. 7 is shown a tapering mandrel H which is employed for expanding the inner sleevepby driving the mandrel therethrough. The amount of pressure placed upon the bushing varies according to the use .to which the 'bearing is to be put, but in the type of bearing illustrated in the lirst eight figures, whichis designed' fory the eve .l of a spring K, a pressure of about 10,000 pounds is employed tO force the mandrel through the inner sleeve.' .Dur-

ing this compression the .carrying agent is substantially, if not'entirely driven out of the fabric vthrough the opening at the ends of the sleeves.. Thus as will be seen, the

inner member is provided at opposite ends with flanges 'L which-V serve as retainers for the bushing. These iangeshoweven 'when the bearing is complete, are spaced a slight distance from the cuter sleeve, as illustrated in Fig. 2. One of the sections, preferably the inner, has the face in engagement with -the bushing, smooth or polished, so as to 'permit this section to freely turn in the ushing. Both bushings are preferably formed of metal. With the construction shown in Fig. 6 the outer metallic sleeve has a driving fit with the eye J of the spring K,

while the inner member is ixedly secured against rotation to the bolt M which con` nects the bearing and the-tackle' N. The bolt M is preferably engaged with the-inner,

p sleeve after the members B, C and D are assembled, and this engagement may be efectedvby drivingthe bolt longitudinally throughthe -inner sleeve, the bolt being provided with a roughened surface or otherwise suitably constructedto prevent relative rotation between the same and the inner sleeve. If desired, the bushing may be compressed within the outer sleeve and then durmg the assembling of the inner member within the outer, only a further slight compression of the bushing eii'ected; In each cas ehowever,

the parts of the bearing are so arranged that an expansible, radial pressure is placed upon the inner member by the bushing, and this pressure is substantially equal throughout all portions of the inner member in engagement with the bushing. v

AWhen the bearing hereinbefore described is employed-for thev eye G of a vehicle spring H it is desirable to secure the sleeve B to the spring eye against relative rotation. I c have devised a novel way of accomplishing this result. Thus in the springs now in general vuse on vehicles, particularly motor vehicles, there is a slight space I between the end J of the Aeye G and the flat body portion K of the 'spring'. I therefore, form upon the outer member B a projection L that is of a Size to be arranged within the space I.

A Preferably the anchor or projection is in the -form of an elongated rib, as shown in Fig. 9; When the outer member B is contracted I.

preferably employ a hollowgmandrel M which has extending longitudinally'thereof a suitable groove N for forming the rib L (see Figs'. 10`and 11), and when the bearing is forced through the hollow mandrel, notv only will the outer sleeve be contracted, but

urthermore,the rib L will be formed. Be

fore forcing the bearing through the'h'ollow I mandrelthe parts are assembled as herein` before described,lwith the -result that the bearing as it leaves the mandrel M. is in finished form. y. Y

What I claim as my invention is`:' 1. The method of making bearings, com- I prisin arrangin compresslble lubricatin g eia twg alesopin reingmaterial interm tively Amovable members, and radi y voomg said material to'form a ushmgV` inte` members by depermanent' creasing the distance between the telscop- 65 ing members.

The method of making bearings, com- 'prismg arranging compressible, lubricating the lubricating material while intermediate the sections to form a bushing therefor, by decreasing the distance between the inner and outer sections.

5. The method of making bearings, com` prising arranging compressible, lubricating material upon one section of the bearing an engaging said section withthe lubricating material thereon with another section, to form inner and outer memberswith the lubricating material therebetween, and in changing the cross-sectional area of one -member by decreasing the distance between the inner and outer sections, whereby the lubricating material is radially compressed.

6. The method of making bearings, comprising arranging compressble, expansible lubricating material intermediate inner an outer relatively-movable members, and radially compressing said material to form a bushing intermediate said members by decreasin the radialdistance between the inner an outer members.

7. The method of making bearings, comprising arranging compresslble, expansiblei ubrioating material intermediate inner an outer: relativc?-j movable members and raf dially compressing said material to form a bushing intermediate said members by decreasin the radial distance between the inner an outer members, and in forming duringthe decreasing of the radial distance an anchor upon the outer member. 8. Thev method of making bearings, comrising arranging compressible, expansible ubricating material intermediate inner a'n outer relativelyA movable members, and con,- tractin the outer member to radially oompress e material intermediate the members and.form a bushinggand'm forming an anchor upon the outer" traction thereof.-

a Themengeassembling of the telescopingmembers in proper relation to each other. Y

ranged `therebetween' compnsing radially ln testimoh whereof l ax my'siglnature in presence o two witnesses.

NORBERT L. @BEECH-T.

posed of telescopio members Having coml pressed expansble ubricatin'g matermlarc'ompressing the lubricating'- material between the -telescoping members during the Witnesses:

WM. J. BELKNAP, JAMES P. BARRY. 

